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2012-04-29 | Coherent phonon dynamics at the martensitic phase transition of Ni_2MnGa | We use time-resolved optical reflectivity to study the laser stimulated
dynamics in the magnetic shape memory alloy Ni_2MnGa. We observe two coherent
optical phonons, at 1.2 THz in the martensite phase and at 0.7 THz in the
pre-martensite phase, which we interpret as a zone-folded acoustic phonon and a
heavily damped a... | 1204.6463v1 |
2012-05-02 | Emergence of physical properties mapped in a two-component system | Emergence of various properties is mapped in a two-component system from
quantum to mesoscale, using Au-Ag alloys. Experiments are designed so that
composition is the primary 'interaction' guiding the evolution of properties
across 'emergent length scales'. In bulk, Au-Ag form near-ideal solid solutions
at all composit... | 1205.0488v1 |
2012-05-24 | Structural and hyperfine characterization of σ-phase Fe-Mo alloys | A series of nine samples of \sigma-Fe_{100-x}Mo_x with 44<x<57 were
synthesized by a sintering method. The samples were investigated experimentally
and theoretically. Using X-ray diffraction techniques structural parameters
such as lattice constants, atomic positions within the unit cell and
populations of atoms over f... | 1205.5413v1 |
2012-05-30 | Type-I superconductivity in ScGa3 and LuGa3 single crystals | We present evidence of type-I superconductivity in single crystals of ScGa3
and LuGa3, from magnetization, specific heat, and resistivity measurements: low
critical temperatures Tc = 2.1-2.2 K; field-induced secondto first-order phase
transition in the specific heat, critical fields less than 240 Oe; and low
Ginzburg-L... | 1205.6836v1 |
2012-07-02 | Kinetic cross coupling between non-conserved and conserved fields in phase field models | We present a phase field model for isothermal transformations of two
component alloys that includes Onsager kinetic cross coupling between the
non-conserved phase field and the conserved concentration field. We also
provide the reduction of the phase field model to the corresponding macroscopic
description of the free ... | 1207.0367v1 |
2012-07-17 | Ultrafast dynamical path for the switching of a ferrimagnet after femtosecond heating | Ultrafast laser-induced magnetic switching in rare earth, transition metal
ferrimagnetic alloys has recently been reported to occur by ultrafast heating
alone. Using atomistic simulations and a ferrimagnetic Landau-Lifshitz-Bloch
formalism, we demonstrate that for switching to occur it is necessary that
angular momentu... | 1207.4092v2 |
2012-06-29 | On the algorithmic behaviour of complex physical systems | Starting from the idea that the underlying mechanisms driving the observable
processes in nature are algorithmic, we exemplify this in two ways: nature
works as a computing machine and thus the processes running on it optimize
themselves in an intrinsic manner so as to save time. As a first example we
will place the em... | 1207.5398v1 |
2012-10-09 | Magnetism in La2O3(Fe1-xMnx)2Se2 tuned by Fe/Mn ratio | We report the evolution of structural and magnetic properties in
La2O3(Fe1-xMnx)2Se2. Heat capacity and bulk magnetization indicate an increased
ferromagnetic component of the long-range magnetic order and possible increased
degree of frustration. Atomic disorder on Fe(Mn) sites suppresses the
temperature of the long-r... | 1210.2711v1 |
2012-10-12 | Minami's estimate: beyond rank one perturbation and monotonicity | In this note we prove Minami's estimate for a class of discrete alloy-type
models with a sign-changing single-site potential of finite support. We apply
Minami's estimate to prove Poisson statistics for the energy level spacing. Our
result is valid for random potentials which are in a certain sense sufficiently
close t... | 1210.3542v3 |
2012-10-15 | Single-carrier impact ionization favored by a limited band dispersion | A critical requirement for high gain and low noise avalanche photodiodes is
the single-carrier avalanche multiplication. We propose that the single-carrier
avalanche multiplication can be achieved in materials with a limited width of
the conduction or valence band resulting in a restriction of kinetic energy for
one of... | 1210.4119v1 |
2012-11-12 | Spin lifetime measurements in GaAsBi thin films | Photoluminescence spectroscopy and Hanle effect measurements are used to
investigate carrier spin dephasing and recombination times in the semiconductor
alloy GaAsBi as a function of temperature and excitation energy. Hanle effect
measurements reveal the product of g-factor and effective spin dephasing time
(gTs) range... | 1211.2711v2 |
2012-11-30 | Spin-dependent optical properties in strained silicon and germanium | We present a comprehensive theory of the circularly polarized luminescence
and its dependence on strain in spin-polarized Si and Ge. Symmetries of
wavefunctions and interactions are used to derive concise ratios between
intensities of the right and left circularly polarized luminescence for each of
the dominant phonon-... | 1211.7292v1 |
2012-12-13 | On the existence of solutions for a drift-diffusion system arising in corrosion modelling | In this paper, we consider a drift-diffusion system describing the corrosion
of an iron based alloy in a nuclear waste repository. In comparison with the
classical drift-diffusion system arising in the modeling of semiconductor
devices, the originality of the corrosion model lies in the boundary conditions
which are of... | 1212.3279v1 |
2013-01-07 | Magnetic domain pattern in hierarchically twinned epitaxial Ni-Mn-Ga films | Magnetic shape memory alloys exhibit a hierarchically twinned microstructure,
which has been well examined in epitaxial Ni-Mn-Ga films. Here we analyze
consequences of this twin within twins microstructure on the magnetic domain
pattern. Atomic and magnetic force microscopy are used to probe the correlation
between the... | 1301.1200v1 |
2013-01-15 | Modified Associate Formalism without Entropy Paradox: Part I. Model Description | A Modified Associate Formalism is proposed for thermodynamic modelling of
solution phases. The approach is free from the entropy paradox described by
L\"{u}ck et al. (Z. Metallkd. 80 (1989) pp. 270--275). The model is considered
in its general form for an arbitrary number of solution components and an
arbitrary size of... | 1301.3213v1 |
2013-02-06 | Energy spectrum of pseudospin-electron model in the dynamical mean-field theory | The pseudospin-electron model in the case of infinite on-site electron
repulsion is investigated. The electron energy spectrum is calculated within
the framework of the dynamical mean field theory (DMFT), and the alloy analogy
approximation is developed. The effect of the pseudospin-electron interaction,
local asymmetr... | 1302.1404v1 |
2013-02-14 | Spectra of Random Operators with absolutely continuous Integrated Density of States | The structure of the spectrum of random operators is studied. It is shown
that if the density of states measure of some subsets of the spectrum is zero,
then these subsets are empty. In particular follows that absolute continuity of
the IDS implies singular spectra of ergodic operators is either empty or of
positive me... | 1302.3296v1 |
2013-02-20 | Grain boundary segregation of C, N and O in hcp titanium from first-principles | It is believed that grain boundary segregation of light interstitials can
serve as possible mechanism of thermal stability in commercially pure
nanostructured titanium alloys. In this paper, using first-principles
calculations, we show that independent segregation of C, N and O atoms at
\Sigma 7 high angle grain bounda... | 1302.4836v2 |
2013-02-22 | Crystal structure and properties of barium thorate BaThO$_3$ from first principles | The phonon spectrum of cubic BaThO$_3$ with the perovskite structure is
calculated from first principles within the density functional theory. The
analysis of unstable modes in the phonon spectrum enables to determine the
symmetry of all possible distorted phases, calculate their energies, and show
that the ground-stat... | 1302.5614v1 |
2013-03-07 | Thickness dependence of the degree of spin polarization of the electrical current in permalloy thin films | Spin-polarized electrical transport is investigated in $
Al_{2}O_{3}/Ni_{80}Fe_{20}/Al_{2}O_{3}$ thin films for permalloy thickness
between 6 and 20nm. The degree of spin-polarization of the current flowing in
the plane of the film is measured through the current induced spin wave Doppler
shift. We find that it decreas... | 1303.1692v1 |
2013-03-22 | Defects in quasicrystals, revisited I-flips, approximants, phason defects | The recent discovery of metadislocations in some periodic complex metallic
alloys and of their 'phason' defects has given a new impetus to the study of QC
approximant defects. In this paper we emphasize: 1- that approximants differ
from a QC by a suitable density of 'flips' only, one per unit cell in the case
of Fibona... | 1303.5563v1 |
2013-06-17 | BZT:a soft pseudo-spin glass | In an attempt to understand the origin of relaxor ferroelectricity, it is
shown that interesting behaviour of the onset of non-ergodicity and of
precursor nanodomains found in first principles simulations of the relaxor
alloy $\mathrm {Ba(Zr}_{1-x}\mathrm{Ti}_{x}\mathrm{)O}_3$ can be understood
easily by a simple mappi... | 1306.4020v3 |
2013-06-18 | Magnetic domain growth in a ferromagnetic Bose-Einstein condensate: Effects of current | Magnetic domain patterns in a ferromagnetic Bose-Einstein condensate (BEC)
show different properties depending on the quadratic Zeeman effect and
dissipation. Another important factor that affects domain patterns and domain
growth is superfluid flow of atoms. Domain growth in a ferromagnetic BEC with
negative quadratic... | 1306.4129v2 |
2013-07-16 | Band Structure and Effective Masses of ZnMgO | We analyze the influence of the Mg concentration on several important
properties of the band structure of ZnMgO alloys in wurtzite structure using ab
initio calculations. For this purpose, the band structure for finite
concentrations is defined in terms of the Bloch spectral density, which can be
calculated within the ... | 1307.4306v1 |
2013-07-17 | Phase separation in Fe2CrSi thin films | Thin films of a nominal Fe2CrSi alloy have been deposited by magnetron
co-sputtering with various heat treatments on MgO and MgAl2O4 substrates. After
heat treatment, the films were found to decompose into a nearly epitaxial Fe3Si
film with the D0$_3$ structure and Cr3Si precipitates with the A15 structure.
We explain ... | 1307.4734v2 |
2013-08-01 | Exchange relaxation as the mechanism of ultrafast spin reorientation in two-sublattice ferrimagnets | In the exchange approximation, an exact solution is obtained for the
sublattice magnetizations evolution in a two-sublattice ferrimagnet. Nonlinear
regimes of spin dynamics are found that include both the longitudinal and
precessional evolution of the sublattice magnetizations, with the account taken
of the exchange re... | 1308.0203v1 |
2013-10-03 | Effects of non-uniform Mn distribution in (Ga,Mn)As | Resonant in situ photoemission from Mn 3d states in Ga_{1-x}Mn_{x}As is
reported for Mn concentrations down to very dilute limit of 0.1 at %. The
properties of the peak at the valence-band maximum reveal an effective
interaction between Mn 3d states for concentration as low as 2.5 %.
Concentration-dependent spectral fe... | 1310.0961v1 |
2013-10-04 | Room temperature optical manipulation of nuclear spin polarization in GaAsN | The effect of hyperfine interaction on the room-temperature defect-enabled
spin filtering effect in GaNAs alloys is investigated both experimentally and
theoretically through a master equation approach based on the hyperfine and
Zeeman interaction between electron and nuclear spin of the spin filtering
defect. We show ... | 1310.1408v2 |
2013-10-10 | Giant nonlinearity in Zero-Gap Semiconductor Superlattices | Using an effective medium approach, we describe how by combining
mercury-cadmium-telluride semiconductor alloys with band gap energies of
opposite signs it may be possible to design a superlattice where the electrons
have isotropic zero-effective mass and a single valley linear energy-momentum
dispersion. We demonstrat... | 1310.2789v1 |
2013-10-14 | PMN: a minimal induced-moment soft pseudo-spin glass perspective | An argument that relaxor ferroelectricity in the isovalent alloy $\mathrm
{Ba(Zr}_{1-x}\mathrm{Ti}_{x})\mathrm{O}_3$ can be understood as an induced
moment soft pseudo-spin glass on the B-ions of the $\mathrm{ABO}_{3}$ matrix is
extended to the experimentally paradigmic but theoretically more complex
heterovalent relax... | 1310.3748v3 |
2013-10-25 | Microscopic origin of the relativistic splitting of surface states | Spin-orbit splitting of surface states is analyzed within and beyond the
Rashba model using as examples the (111) surfaces of noble metals, Ag2Bi
surface alloy, and topological insulator Bi2Se3. The ab initio analysis of
relativistic velocity proves the Rashba model to be fundamentally inapplicable
to real crystals. Th... | 1310.6893v2 |
2013-11-13 | Hysteretic electrical transport in BaTiO$_3$/Ba$_{1-x}$Sr$_x$TiO$_3$/Ge heterostructures | We present electrical transport measurements of heterostructures comprised of
BaTiO$_3$ and Ba$_{1-x}$Sr$_x$TiO$_3$ epitaxially grown on Ge. The Sr-alloying
imparts compressive strain to the BaTiO$_3$, which enables the thermal
expansion mismatch between BaTiO$_3$ and Ge to be overcome to achieve $c$-axis
oriented grow... | 1311.3281v1 |
2013-12-05 | Magnetic properties of ferromagnetic Pu2Pt3Si5 | The structural, magnetic, and thermodynamic properties of a new plutonium
based compound, Pu2Pt3Si5, are reported. Single crystals produced by a Sn-flux
technique have been analyzed showing a ferromagnetic behavior at 58 K.
Pu2Pt3Si5 crystallizes in the U2Co3Si5-type orthorhombic Iabm structure (72)
with atomic paramet... | 1312.1576v1 |
2013-12-13 | Free carrier absorption in cascade structures due to static scatterers in the in-plane polarization | We report on the computation of the free carrier absorption induced by static
scatterers in cascade structures when the electromagnetic wave propagates along
the growth axis. We find that a Drude-like tail exists for this polarization.
The absorption is found larger than when the wave propagates in the layer
plane. Als... | 1312.3767v1 |
2013-12-19 | Probing the local environment of two-dimensional ordered vacancy structures in Ga2SeTe2 via aberration-corrected electron microscopy | There has been considerable interest in chalcogenide alloys with high
concentrations of native vacancies that lead to properties desirable for
thermoelectric and phase-change materials. Recently, vacancy ordering has been
identified as the mechanism for metal-insulator transitions observed in
GeSb2Te4 and an unexpected... | 1312.5387v1 |
2013-12-21 | Atomistic Potentials for Palladium-Silver Hydrides | New EAM potentials for the ternary palladium-silver-hydrogen system are
developed by extending a previously developed palladium-hydrogen potential. The
ternary potentials accurately capture the heat of mixing and structural
properties associated with solid solution alloys of palladium-silver. Stable
hydrides are produc... | 1312.6316v1 |
2014-01-06 | The DynAlloy Visualizer | We present an extension to the DynAlloy tool to navigate DynAlloy
counterexamples: the DynAlloy Visualizer. The user interface mimics the
functionality of a programming language debugger. Without this tool, a DynAlloy
user is forced to deal with the internals of the Alloy intermediate
representation in order to debug a... | 1401.0973v1 |
2014-01-29 | Giant Seebeck coefficient in semiconducting single-wall carbon nanotube film | We found a giant Seebeck effect in semiconducting single-wall carbon nanotube
(SWCNT) films, which exhibited a performance comparable to that of commercial
Bi2Te3 alloys. Carrier doping of semiconducting SWCNT films further improved
the thermoelectric performance. These results were reproduced well by
first-principles ... | 1401.7469v1 |
2014-02-06 | Thermal response of double-layered metal films after ultrashort pulsed laser irradiation: the role of nonthermal electron dynamics | The thermal response of a Cu-Ti double-layered film is investigated after
laser irradiation with ultrashort pulses (pulse duration {\tau}p=50fs, 800nm
laser wavelength) in submelting conditions by including the influence of
nonthermal electrons. A revised two-temperature model is employed to account
for the contributio... | 1402.1274v1 |
2014-03-03 | Suppression of antiferromagnetic order in low-dopped ceramic samples La_{2-x}Sr_{x}CuO_{4} | Possible influence of spatially inhomogeneous distribution of strontium
impurities on the temperature of antiferromagnetic (AFM) ordering in ceramic
samples La2-xSrxCuO4 has been revealed. | 1403.0456v1 |
2014-03-24 | Two new mathematical models to predict the flow stress at hot deformation | Based on both linear and non-linear estimations of work hardening rate versus
strain curves, two mathematical models have been developed to predict the flow
curves under hot working conditions up to the peak. The models were tested for
a mechanically alloyed Al6063/0.75Al2O3/0.75Y2O3 nanocomposite under different
hot f... | 1403.5929v1 |
2014-04-09 | Quantum annealing | Brief description on the state of the art of some local optimization methods:
Quantum annealing Quantum annealing (also known as alloy, crystallization or
tempering) is analogous to simulated annealing but in substitution of thermal
activation by quantum tunneling. The class of algorithmic methods for quantum
annealing... | 1404.2465v1 |
2014-04-13 | Contact melting and the structure of binary eutectic near the eutectic point | Computer simulations of contact melting and associated interfacial phenomena
in binary eutectic systems were performed on the basis of the standard
phase-field model with miscibility gap in solid state. It is shown that the
model predicts the existence of equilibrium three-phase (solid-liquid-solid)
states above the eu... | 1404.3379v2 |
2014-07-27 | OKMC simulations of Fe-C systems under irradiation: sensitivity studies | This paper continues our previous work on a nanostructural evolution model
for Fe-C alloys under irradiation, using Object Kinetic Monte Carlo modeling
techniques. We here present a number of sensitivity studies of parameters of
the model, such as the carbon content in the material, represented by generic
traps for poi... | 1407.7225v1 |
2014-07-31 | Electronic structure of non-centrosymmetric superconductors Re24(Nb;Ti)5 by ab initio calculations | Electronic structures of superconducting Re24Nb5 and Re24Ti5 have been
calculated employing the full-potential local-orbital method within the density
functional theory. The investigations were focused on the influence of the
antisymmetric spin-orbit coupling on band structures and Fermi surfaces of
these non-centrosym... | 1407.8416v1 |
2014-08-19 | Reduction of Dissipative Nonlinear Conductivity of Superconductors by Static and Microwave Magnetic Fields | A theory of dissipative nonlinear conductivity, $\sigma_1(\omega,H)$, of
s-wave superconductors under strong electromagnetic fields at low temperatures
is proposed. Closed-form expressions for $\sigma_1(H)$ and the surface
resistance $R_s(\omega,H)$ are obtained in the nonequilibrium dirty limit for
which $\sigma_1(H)$... | 1408.4476v1 |
2014-08-20 | Exponential decay of eigenfunctions in a continuous multi-particle Anderson model with sub-exponentially decaying interaction | This short note is a complement to our recent paper [2] where we established
strong dynamical localization for a class of multi-particle Anderson models in
a Euclidean space with an alloy-type random potential and a sub-exponentially
decaying interaction of infinite range. We show that the localized
eigenfunctions at l... | 1408.4646v1 |
2014-08-29 | Structure and gap of low-$x$ (Ga$_{1-x}$In$_x$)$_2$O$_3$ alloys | We study the electronic and local structural properties of pure and
In-substituted $\beta$-Ga$_2$O$_3$ using density functional theory (DFT). Our
main result is that the structural energetics of In in Ga$_2$O$_3$ causes most
sites to be essentially inaccessible to In substitution, thus reducing the
maximum In content i... | 1408.6951v1 |
2014-10-21 | Magnetic switching dynamics in a ferrimagnetic two sub-lattice model including ultrafast exchange scattering | We study the heat-induced magnetization dynamics in a toy model of a
ferrimagnetic alloy, which includes localized spins antiferromagnetically
coupled to an itinerant carrier system with a Stoner gap. We determine the
one-particle spin-density matrix including exchange scattering between
localized and itinerant bands a... | 1410.5745v2 |
2014-11-01 | A Giant, High-frequency Oscillation of Metal Strip Actuator under DC Electric Field | Different from conventional electroactive polymers, here we firstly present a
new facile actuator made from aluminum alloy. The high-frequency electrically
induced flapping motion was characterized under varied physical factors. This
electroactuation results from alternative processes of charge induction and
discharge,... | 1411.0079v1 |
2014-11-11 | Mn as surfactant for the self-assembling of Al$_x$Ga$_{1-x}$N/GaN layered heterostructures | The structural analysis of GaN and Al$_x$Ga$_{1-x}$N/GaN heterostructures
grown by metalorganic vapor phase epitaxy in the presence of Mn reveals how Mn
affects the growth process, and in particular the incorporation of Al, the
morphology of the surface, and the plastic relaxation of Al$_x$Ga$_{1-x}$N on
GaN. Moreover,... | 1411.3006v1 |
2014-11-18 | Study of the specific heat for the binary alloy in the CPA+DMFT method | The thermodynamic properties of strongly correlated system with binary type
of disorder are investigated using the combination of the coherent potential
approximation and dynamical mean-field theory. The specific heat has a peak at
small temperatures for the concentrations close to the filling of system. This
peak is a... | 1411.4775v2 |
2014-12-17 | Revealing the role of orbital magnetism in ultrafast laser-induced demagnetization in multisublattice metallic magnets by terahertz spectroscopy | Simultaneous detection of THz emission and transient magneto-optical response
is employed to study ultrafast laser-induced magnetization dynamics in
multisublattice magnets NdFeCo and GdFeCo amorphous alloys with in-plane
magnetic anisotropy. A satisfactory quantitative agreement between the dynamics
revealed with the ... | 1412.5396v1 |
2015-01-28 | Material Properties at Low Temperature | From ambient down to cryogenic temperatures, the behaviour of materials
changes greatly. Mechanisms leading to variations in electrical, thermal,
mechanical, and magnetic properties in pure metals, alloys, and insulators are
briefly introduced from a general engineering standpoint. Data sets are
provided for materials ... | 1501.07100v1 |
2015-02-02 | Electrical and magnetic properties of La$_{0.5}$Rh$_4$Sb$_{12}$ filled skutterudite synthesized at high pressure | A filled skutterudite, La$_{0.5}$Rh$_4$Sb$_{12}$, with a lattice constant of
9.284(2) {\AA} was synthesized using a high-pressure technique. The electrical
resistivity showed semiconducting behavior and the energy gap was estimated to
be more than 0.08 eV. Magnetic susceptibility measurements indicated
temperature-inde... | 1502.00337v2 |
2015-02-05 | Study of the Electron Mobility in InAs/GaSb Type II Superlattices at High Temperatures | In this paper, we present a study of the effects of temperature on the
electron mobility in InAs/GaSb type-II superlattices (SLs) in which the band
structures and wave functions are calculated by solving the K.P Hamiltonian
using the numerical Finite Difference method. In the model the dominant
scattering mechanisms su... | 1502.01453v1 |
2015-06-04 | Near-Field Plasmonic Behavior of Au/Pd Nanocrystals with Pd-Rich Tips | Using nanometer spatial resolution electron-energy loss spectroscopy (EELS),
energy dispersive X-ray spectroscopy (EDS), and cathodoluminescence (CL)
mapping, we demonstrate that Au alloys containing a poor plasmonic metal (Pd)
can nevertheless sustain multiple size-dependent localized surface plasmon
resonances and ob... | 1506.01650v1 |
2015-06-09 | Convergence of a Finite Volume Scheme for a Corrosion Model | In this paper, we study the numerical approximation of a system of partial
dif-ferential equations describing the corrosion of an iron based alloy in a
nuclear waste repository. In particular, we are interested in the convergence
of a numerical scheme consisting in an implicit Euler scheme in time and a
Scharfetter-Gum... | 1506.02996v1 |
2015-07-13 | Defect induced structural and thermoelectric properties of Sb2Te3 alloy | Structural and thermoelectric properties of metallic and semiconducting
Sb2Te3 are reported. X-Ray diffraction and Raman spectroscopy studies reveal
that semiconducting sample have higher defect density. Nature and origin of
possible defects are highlighted. Semiconducting Sb2Te3 hosts larger numbers of
defects, which ... | 1507.03337v1 |
2015-07-13 | Metallic nanoparticles meet Metadynamics | We show how standard Metadynamics coupled with classical Molecular Dynamics
can be successfully ap- plied to sample the configurational and free energy
space of metallic and bimetallic nanopclusters via the implementation of
collective variables related to the pair distance distribution function of the
nanoparticle its... | 1507.03505v1 |
2015-07-16 | Proximity Effect in Periodic Arrays of Superconducting Nanoislands on Thin Graphite Layer | The regular structure of superconducting nanoislands of alloy W-Ga-C was
fabricated on nanothin graphite using focused ion beam. The resistance vs
temperature dependence down to 1.7K and the magnetoresistance in field up to
24T were measured both for the bridge containing nanoislands and for the
reference bridge withou... | 1507.04584v1 |
2015-12-14 | Superconductivity in the Niobium-rich compound Nb5Se4 | The niobium rich selenide compound Nb5Se4 was synthesized at ambient pressure
by high-temperature solid-state reaction in a sealed Ta tube. Resistivity and
heat capacity measurements reveal that this compound is superconducting, with a
T_c = 1.85K. The electronic contribution to the specific heat {\gamma} and the
Debye... | 1512.04144v1 |
2015-12-25 | Ellipsometry studies of Si/Ge superlattices with embedded Ge dots | In this paper, we present an analysis for treating the spectroscopic
ellipsometry response of Si/Ge superlattices (SL) with embedded Ge dots.
Spectroscopic ellipsometry (SE) measurement at room temperature was used to
investigate optical and electronic properties of Si/Ge SL which were grown on
silicon (Si) wafers havi... | 1512.07994v1 |
2016-01-08 | A survey of ab-initio calculations shows that segregation-induced grain boundary embrittlement is predicted by bond-breaking arguments | The segregation of solute atoms to grain boundaries can have a large
influence on the mechanical behavior of polycrystals, particularly in metallic
alloys. An overview of 400 calculations of solute-induced changes in grain
boundary cohesion from 77 separate studies quantitatively demonstrates that the
majority of the v... | 1601.01759v1 |
2016-01-19 | On the photoinduced phase transition in (GeTe)n(Sb2Te3)m | We suggest a phenomenological description of the photo-conversion in Ge-Sb-Te
phase-change memory alloys from amorphous to crystalline phase which explains
why both photo-excitation and high temperatures T > 160C are required for the
transition from hexagonal to tetrahedral phase. The position of chemical
potential at ... | 1601.04982v1 |
2016-01-31 | Application of the Mössbauer spectroscopy to study harmonically modulated electronic structures: case study of charge- and spin-density waves in Cr and its alloys | Relevance of the M\"ossbauer spectroscopy in the study of harmonically
modulated electronic structures i.e. spin-density waves (SDWs) and
charge-density waves (CDWs) is presented and discussed. First, the effect of
various parameters pertinent to the SDWs and CDWs is outlined on simulated
119Sn spectra and distribution... | 1602.00272v1 |
2016-02-18 | Metallic Nickel Silicides: Experiments and Theory for NiSi and First Principles Calculations for Other Phases | We report detailed experimental investigation of the transport and magnetic
properties of orthorhombic NiSi along with first principles studies of this
phase and related nickel silicides. Neutron scattering shows no evidence for
magnetism, in agreement with first principles calculations. Comparison of first
principles ... | 1602.05840v1 |
2016-02-23 | Phonon Unfolding: A program for unfolding phonon dispersions of materials | We present Phonon Unfolding, a Fortran90 program for unfolding phonon
dispersions. It unfolds phonon dispersions by using a generalized projection
algorithm, which can be used to any kind of atomic systems in principle. Thus
our present program provides a very useful tool for the phonon dispersion and
vibration mode an... | 1602.07030v1 |
2016-02-26 | Microscopic mechanism of the giant magnetocaloric effect in MnCoGe alloys probed by XMCD | One important aspect of the magneto-structural transition in MnCoGe and
related materials is the reduction in saturation magnetization from the
orthorhombic to the hexagonal phase. Here, by combining an element specific
magnetization probe such as x-ray magnetic circular dichroism and band
structure calculations, we sh... | 1602.08263v1 |
2016-05-09 | Nanoassembly of Polydisperse Photonic Crystals based on Binary and Ternary Polymer Opal Alloys | Ordered binary and ternary photonic crystals, composed of different sized
polymer-composite spheres with diameter ratios up to 120%, are generated using
bending induced oscillatory shearing (BIOS). This viscoelastic system creates
polydisperse equilibrium structures, producing mixed opaline colored films with
greatly r... | 1605.02676v1 |
2016-05-12 | Transmission of spin waves in ordered FeRh epitaxial thin films | We report on B2-ordering dependence of magnetostatic surface spin waves in
ferromagnetic FeRh at room temperature. Spin waves transmit over a distance
longer than 21 {\mu}m in highly ordered FeRh alloys even with relatively large
spin-orbit interaction. The long-range transmission likely arises from the
induced Rh mome... | 1605.03798v1 |
2016-06-21 | Experimental evidence of effective <111> atomic exchanges in a B2 intermetallic alloy | We report on an atomic-scale X-ray Photon Correlation Spectroscopy study on
Fe-rich FeAl in the B2-ordered regime revealing effective <111>-exchanges of
atoms on the Al-sublattice. The diffusion mechanism responsible for these
exchanges is the dominating process for chemical diffusion and therefore
controls long-range ... | 1606.06516v2 |
2016-08-03 | On the role of Sm in solidification of Al-Sm metallic glasses | During the solidification of Al-Sm metallic glasses the evolution of the
supercooled liquid atomic structure has been identified with an increasing
population of icosahedral-like clusters with increasing Sm concentration. These
clusters exhibit slower kinetics compared to the remaining clusters in the
liquid leading to... | 1608.01226v1 |
2016-10-14 | DC Magnetization study of Ni$_{1-x}$Rh$_x$ nanoalloy | Ni$_{1-x}$Rh$_x$ bulk alloys exhibit a ferromagnetic to paramagnetic quantum
phase transition (QPT) at the critical concentration $x_c \sim$ 0.37. A spin
glass phase arises below the Ferromagnetism by controlling the short range
interaction between Ni and Rh atoms. we have synthesized nanoalloys of two
different concen... | 1610.04487v1 |
2016-11-28 | A new class of half-metallic ferromagnets from first principles | Half-metallic ferromagnetism (HMFM) occurs rarely in materials and yet offers
great potential for spintronic devices. Recent experiments suggest a class of
compounds with the `ThCr$_{2}$Si$_{2}$' (122) structure -- isostructural and
containing elements common with Fe pnictide-based superconductors -- can
exhibit HMFM. ... | 1611.09422v2 |
2017-01-01 | Electrical Transport of perpendicularly magnetized L10-MnGa and MnAl films | Ferromagnetic films of L10-ordered MnGa and MnAl that exhibit giant
perpendicular magnetic anisotropy and great controllability in the magnetism
and structural disorders show promise not only in the applications in magnetic
recording, permanent magnets and spintronics, but also in controllable studies
of disorder-relev... | 1701.00191v1 |
2017-03-03 | Spin-orbit effective fields in Pt/GdFeCo bilayers | In the increasing interests on spin-orbit torque (SOT) with various magnetic
materials, we investigated SOT in rare earth-transition metal ferrimagnetic
alloys. The harmonic Hall measurements were performed in Pt/GdFeCo bilayers to
quantify the effective fields resulting from the SOT. It is found that the
damping-like ... | 1703.00995v1 |
2017-03-27 | Gamma relaxation in bulk metallic glasses | Studying the primary {\alpha}- and secondary {\beta}-relaxation process has
contributed significantly to the understanding of the structure and rheology of
metallic glasses. In this letter, we report on a third relaxation mechanism
indicated by a maximum in the loss modulus at low temperatures, which we term
{\gamma}-r... | 1703.09016v1 |
2017-07-14 | Effect of particle size and inter-particle spacing on dislocation behaviour of Nickel based super alloys | Ni-based superalloys have been the subject of enormous usage in scenarios
where the loading is heavy and often occurs at elevated temperatures. The
strengthening mechanisms that come into play within the metallic lattice have
been studied extensively as micromechanical MMC models. These continuum
formulations suffer fr... | 1707.04398v1 |
2017-08-30 | Two-dimensional Rashba metals: unconventional low-temperature transport properties | Rashba spin-orbit coupling emerges in materials lacking of structural
inversion symmetry, such as heterostructures, quantum wells, surface alloys and
polar materials, just to mention few examples. It yields a coupling between the
spin and momentum of electrons formally identical to that arising from the
weakly-relativi... | 1708.09331v1 |
2017-09-28 | Switching of Co magnetization driven by antiferromagnetic-ferromagnetic phase transition of FeRh alloy in Co/FeRh bilayers | We show that Co spins in Co/FeRh epitaxial bilayers grown on W(110) switch
reversibly between the two orthogonal in-plane directions as the FeRh layer
undergoes temperature driven antiferromagnetic-ferromagnetic (AFM-FM) phase
transition. Switching of Co magnetization is characterized by a hysteretic
behavior owing to ... | 1709.09928v1 |
2017-12-20 | Information entropy of liquid metals | Correlations reduce the configurational entropies of liquids below their
ideal gas limits. By means of first principles molecular dynamics simulations,
we obtain accurate pair correlation functions of liquid metals, then subtract
the mutual information content of these correlations from the ideal gas
entropies to predi... | 1712.07679v3 |
2017-12-24 | Using Liquid Metal in an Electromechanical Motor with Breathing Mode Motion | Electromechanical actuators exploit the Lorentz force law to convert
electrical energy into rotational or linear mechanical energy. In these
electromagnetically induced motions, the electrical current flows through wires
that are rigid and consequently the types of motion generated are limited.
Recent advances in prepa... | 1801.01405v1 |
2018-02-28 | Materials data validation and imputation with an artificial neural network | We apply an artificial neural network to model and verify material
properties. The neural network algorithm has a unique capability to handle
incomplete data sets in both training and predicting, so it can regard
properties as inputs allowing it to exploit both composition-property and
property-property correlations to... | 1803.00133v1 |
2018-03-03 | On the correlation of shear band formation and texture evolution in $α$-brass during accumulative roll bonding | We studied the microstructural evolution of the low stacking fault energy
$\alpha$-brass alloy CuZn15 during accumulative roll bonding (ARB). Most
notably, the typical brass-type texture was clearly observed after four ARB
passes (approx. 93.8 % total thickness reduction), before significant shear
localization set in. ... | 1803.01251v1 |
2018-05-14 | Additive Manufacturing of Nickel Based Superalloy | This paper reviews the use of relatively new manufacturing method called as
additive manufacturing, most often mentioned as 3D printing in fabrication of
high performance superalloys. The overview of the article describes the
structure, property, processing, performance relationship of the fabrication
process and the s... | 1805.11664v1 |
2018-09-06 | Thin film superconducting quantum interferometer with ultralow inductance | A simple method has been developed for manufacturing a thin film
superconducting quantum interferometer (SQI) with ultralow inductance (~10^-13
H). Current-voltage and voltage-field characteristics of the SQI are presented.
The basic design equations are obtained and confirmed experimentally. The SQI
has been used for ... | 1809.01932v1 |
2018-09-23 | Assessing the Utility of Structure in Amorphous Materials | This paper presents a set of general strategies for the analysis of structure
in amorphous materials and a general approach to assessing the utility of a
selected structural description. Measures of structural diversity and utility
are defined and applied to two model glass forming binary atomic alloys. In
addition, a ... | 1809.08589v2 |
2018-11-15 | Error and stability analysis of an anisotropic phase-field model for binary-fluid mixtures in the presence of magnetic-field | In this article, we study the error and stability of the proposed numerical
scheme in order to solve a two dimensional anisotropic phase-field model with
convection and externally applied magnetic field in an isothermal
solidification of binary alloys. The proposed numerical scheme is based on
mixed finite element meth... | 1811.06239v1 |
2019-11-08 | Magnetic i-MXene: a new class of multifunctional two-dimensional materials | Based on density functional theory calculations, we investigated the
two-dimensional in-plane ordered MXene (i-MXenes), focusing particularly on the
magnetic properties. It is observed that robust two-dimensional magnetism can
be achieved by alloying nonmagnetic MXene with magnetic transition metal atoms.
Moreover, bot... | 1911.03470v1 |
2019-11-12 | Ultrafast synthesis of Pb-doped BiCuSeO oxyselenides by high-energy ball milling | We report on the direct ultrafast synthesis of Pb-doped BiCuSeO oxyselenides
by high-energy ball milling. We show that, contrary to the mechanical alloying
sintering routes used in the previous reports which require 7 - 13 hours to
fabricate the BiCuSeO phase in powder form, this synthesis technique enables us
to obtai... | 1911.04843v2 |
2019-11-27 | Onset of a skyrmion phase by chemical substitution in MnGe chiral magnet | We study the evolution of the magnetic phase diagram of Mn$_{1-x}$Fe$_{x}$Ge
alloys with concentration $x$ ($0 \leq x \leq 0.3$) by small-angle neutron
scattering. We unambiguously observe the absence of a skyrmion lattice (or
A-phase) in bulk MnGe and its onset under a small Mn/Fe substitution. The
A-phase is there en... | 1911.12190v1 |
2017-04-16 | Raman study of lattice vibrations in type II superlattice InAs/InAs1-xSbx | In this work, we report a polarized Raman study on the vibrational properties
of the InAs/InAs1-xSbx SLs as well as selected InAs1-xSbx alloys, all grown on
GaSb substrates by either MBE or MOCVD, from both growth surface and cleaved
edge. | 1704.04770v1 |
2017-04-26 | Study of the composition dependence of the ionic conductivity of LiH_{x}D_{1-x} alloys | Recent observations have shown that at a certain composition of solid
solutions AgCl$_x$Br$_{1-x}$, AgCl-CdCl$_2$, AgBr-CdBr$_2$, of ionic crystals,
the electrical conductivity exhibits a value appreciably larger than that of
the end constituents. Here, we investigate the electrical conductivity $\sigma$
of LiH$_x$D$_{... | 1704.08047v1 |
2017-04-27 | Calculation of the bulk modulus of mixed ionic crystal NH_4Cl_{1-x}Br_x | The ammonium halides present an interesting system for study in view of their
polymorphism and the possible internal rotation of the ammonium ion. The static
properties of the mixed ionic crystal NH$_4$Cl$_{1-x}$Br$_x$ have been recently
investigated, using three-body potential model (TDPM) by the application of
Vegard... | 1704.08456v1 |
2017-05-18 | Phase Diagram of Carbon Nickel Tungsten: Superatom Model | Carbon solubility in face-centered cubic Ni-W alloys and the phase diagram of
C-Ni-W are investigated by means of first principle calculations and semi-grand
canonical Monte Carlo simulations. With density functional theory (DFT) total
energies as fitting data, we build a superatom model for efficient simulation.
Multi... | 1705.06641v1 |
2018-07-15 | Improvement of Thermoelectric properties of Lanthanum cobaltate by Sr and Mn co-substitution | We report thermoelectric (TE) properties of Sr and Mn co-substituted LaCoO3
system from room temperature to 700 K. Sr-substitutions at La and Mn at Co site
in LaCoO3 improves the electrical conductivity ({\sigma}). Thermal conductivity
(\k{appa}) of all the samples increases with the increase in temperature but
decreas... | 1807.05562v1 |
2018-07-16 | Absence of strong skew scattering in crystals with multi-sheeted Fermi surfaces | We consider an extrinsic contribution to the anomalous and spin Hall effect
in dilute alloys based on Fe, Co, Ni, and Pt hosts with different
substitutional impurities. It is shown that a strong skew-scattering mechanism
is absent in such crystals with multi-sheeted Fermi surfaces. Based on this
finding, we conclude on... | 1807.05903v1 |
2018-10-20 | On Fractional Annealing Process | The paper deals with a full annealing process, for example for a metal alloy
perturbed by some fractional noise caused by conditions in furnace such as
initial temperature, initial structure of material itsel. The energy of the
heating matter system depending on its states at each time, we consider some
steady state at... | 1810.09916v1 |
2018-10-28 | Active Learning of Uniformly Accurate Inter-atomic Potentials for Materials Simulation | An active learning procedure called Deep Potential Generator (DP-GEN) is
proposed for the construction of accurate and transferable machine
learning-based models of the potential energy surface (PES) for the molecular
modeling of materials. This procedure consists of three main components:
exploration, generation of ac... | 1810.11890v2 |
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